JPH039047A - Throttle valve opening control device for internal combustion engine - Google Patents

Abstract

PURPOSE:To control the throttle valve opening most appropriately so as to improve a driving feeling by factor analyzing the operating state parameter of the throttle valve opening, engine speed, and the like and judging the driving state such as slow driving in the urban area and high speed sportive running. CONSTITUTION:A throttle valve is controlled to the target opening at a means B according to the accelerator operating quantity detected at a means A. In this case, the operating state parameter of an internal combustion engine is detected at a means C, and the representative data is prepared at a means D on the basis of the detected result. The satisfaction degree of each evaluation function is enumerated at a means E using the specified evaluation function based on the specified operating state parameter as well as on the basis of the representative data of each operating state parameter, and the driving state is judged at a means F on the basis of the enumerated result. The characteristic of the target throttle valve opening is then set at a means G, and this characteristic is selected at a means H according to the operating state. The means B is then provided with the selected characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device that recognizes the operating state of a vehicle and controls the throttle valve opening.

<Prior Art> Conventionally, a common driving method is to mechanically interlock a throttle valve installed in an intake system with depression of an accelerator pedal.

In that case, for example, if the diameter of the throttle chamber is designed to be large with emphasis on the output performance of the engine, the rise curve of the amount of intake air relative to the amount of accelerator operation will be accelerated, making it difficult to achieve smooth drivability when driving in traffic jams, etc., resulting in jerky driving. It feels like it.

On the other hand, if the rising curve is set later, the driving performance when driving in traffic jams will be improved, but the acceleration response will be reduced, so the driving performance during sporty driving with acceleration in light traffic will be reduced. descend.

Therefore, the relationship between the diameter of the throttle chamber and the accelerator operation amount-intake air amount characteristic is set as a compromise between engine output performance and drivability, but it is not an optimal point.

There is also a system that detects the amount of accelerator operation and electronically controls the throttle valve to a target opening degree using feedback control (see Japanese Patent Laid-Open No. 1984-1984, etc.).

With this device, the characteristics of the throttle valve opening with respect to the accelerator operation amount can be made non-linear, so the accelerator operation amount -
The degree of freedom in setting the intake air amount characteristics increases.

<Problems to be Solved by the Invention> However, even with this method of controlling the throttle valve to the target opening according to the amount of accelerator operation, it still does not have the characteristics that are optimally matched to driving in traffic jams, etc., and the sporty style. Since the characteristics are different from the characteristics that are optimally matched during driving, it is not possible to obtain the characteristics that are optimally matched for both at the same time.

Therefore, even in this case, the characteristics are still set as a compromise between the different driving conditions, and the characteristics are not optimal for each driving condition.

For this reason, it may be possible to set multiple characteristics and switch the characteristics according to changes in the driving situation, but it would be too cumbersome for the driver to judge changes in the driving situation and manually switch the characteristics. It has low practical value.

The present invention was developed in view of these conventional problems, and automatically recognizes and judges the driving situation and adjusts the amount of accelerator operation.
It is an object of the present invention to provide a throttle valve opening control device for an internal combustion engine that can switch the throttle valve opening characteristic to a characteristic that optimally matches the operating conditions.

<Means for Solving the Problems> For this reason, the present invention, as shown in FIG. In a throttle valve opening control device for an internal combustion engine that controls the throttle valve opening to a target throttle valve opening that is set according to a detected accelerator operation amount, a plurality of operating states including at least the throttle valve opening and the engine rotation speed are provided. an operating state parameter detection means for sampling the state quantity of the parameter every unit time to obtain time series data; a representative data creation means for creating representative data from the time series data for each operating state parameter; satisfaction calculation means for calculating the degree of satisfaction of each evaluation function based on representative data of a plurality of driving condition parameters using an evaluation function based on driving condition parameters for the driving condition; a driving state determining means for determining a driving state; an opening characteristic setting means for setting a characteristic of a target throttle valve opening with respect to an accelerator operation amount for each different driving state; a characteristic selecting means for selecting an opening characteristic of a corresponding operating state from the opening characteristic setting means; and a throttle valve being detected by an accelerator operation amount detecting means using the opening characteristic selected by the characteristic selecting means. opening control means for controlling the target throttle valve opening according to the accelerator operation amount;
The configuration is equipped with the following.

<Function> As shown in Fig. 2, the driving conditions to be recognized and judged are divided into, for example, traffic jam driving, city driving, high speed driving, and sports driving, and the throttle and valve opening degrees TVO in these driving conditions are determined.
, its rate of change ΔTVO/ΔL.

Approximate state quantities (small, medium, large) of operating state parameters such as the engine speed N and its rate of change ΔN/ΔL are determined in advance, and these are used as an evaluation function (membership function) of the operating state.

In recognizing the operating state, first, state quantities of a plurality of operating state parameters such as the throttle valve opening TVO and the engine speed N are sampled every unit time to obtain time-series data.

Next, representative data is created from the time series data for each operating state parameter.

Next, using a plurality of predetermined evaluation functions for driving conditions, the degree of satisfaction of each evaluation function is calculated based on representative data of the plurality of driving condition parameters.

Next, from each satisfaction level of multiple evaluation functions, the operating status is quantified either directly or by calculating the weighted average cylinder.
Determine driving status.

According to the judgment result of this driving condition, driving in Zunawaji traffic jam,
According to city driving, high-speed driving, sports driving, etc., the characteristic selection means selects the optimum characteristic suitable for the driving condition from among the accelerator operation amount-target throttle valve opening characteristics set by the opening characteristic setting means.

Then, using the selected characteristic, the opening control means controls the throttle valve opening to a target throttle valve opening corresponding to the accelerator operation amount detected by the accelerator operation amount detection means.

<Example> The present invention will be explained in detail below.

Referring to FIG. 3, a throttle valve 2 is interposed in an intake passage 1 of the engine. The throttle valve 2 has its support shaft connected to a DC motor 3, and the DC motor 3 is operated by a signal (frequency modulation signal) from a control unit 4 with a built-in microcomputer, and controls the throttle valve 2 to a target opening. Control.

The control units 1 to 4 include an accelerator pedal 5.
In addition to the accelerator sensor 6, which is attached to the throttle valve 2 and serves as an accelerator operation amount detection means for detecting the amount of depression of the accelerator pedal 5 (accelerator operation amount), the throttle sensor is attached to the throttle valve 2 and detects the throttle valve opening degree TVO. 7
9 Crank angle sensor for detecting engine speed N 8. Vehicle speed sensor for detecting vehicle speed9. A detection signal from a gear position sensor 10 or the like that detects the gear position of the transmission is input.

The operating state is recognized based on the signals from these sensors, and the throttle valve opening degree is controlled in accordance with the recognized operating state.

First, driving state recognition will be explained. Throttle valve opening TVO is used as an operating state parameter for operating state recognition.
, its rate of change ΔTVO/ΔL1 engine rotational speed N, its rate of change ΔN/ΔL, vehicle speed vsp.

Its rate of change ΔVSP/Δt, gear position (L, M.

H), gear position change frequency (number of shifts/time) is detected every unit time.

However, for convenience of explanation, the operating state parameters will be limited to the throttle valve opening TVO and the engine speed N in the following description.

The control unit recognizes the operating state according to the flowchart shown in FIG.

In step 1 (denoted as Sl in the figure; the same applies hereinafter), the throttle valve opening TVO is sampled every unit time to obtain time series data of the throttle valve opening TVO in a predetermined time interval.

This step 1 corresponds to the operating state parameter detection means.

In step 2, each piece of sampling data is evaluated using a predetermined evaluation function of small, medium, and large for the throttle valve opening TVO, and is assigned to medium or large.

For example, if the sampling data of the throttle valve opening at a certain point in time is TVO, 0.3 out of 0.7 degrees. Allocate as large as 0.0.

In step 3, the small and
For the assignment of medium and large dogs, the values are integrated, and a frequency distribution for small, medium, and dog is created.

In step 4, representative data of the throttle valve opening degree is determined from the frequency distribution of small, medium, and large.

In other words, the numbers increase in the order of small, medium, and dog. , the weights of each of these, w,, w2, w,.

(for example, small w+=0.25.medium w2
-0.50. Large W3 = 0.75), and assuming that each frequency (allocation is an integrated value of values) is a; b, c, representative data W is calculated by taking a weighted average from the following equation.

The centroid may be determined and used as representative data.

Here, steps 2 to 4 correspond to representative data creation means, and among them, step 2 in particular corresponds to allocation means.

In step 5, a predetermined driving state evaluation function is used for representative data (small, medium, and large data) to evaluate the representative data and drive in traffic jams.

Assigned to city driving, high-speed driving, and sports driving.

For example, if the representative data of the throttle valve opening is Wl, driving in traffic jam is 0.3. City driving 0.7. High speed running 0.
0. Assign sports driving 0.0.

In addition, in steps 1' to 5', in parallel with steps 1 to 5, the same processing as these is performed for the engine speed N1, and representative data of the engine speed N is evaluated and Running.

Assigned to sports driving.

Then proceed to step 6.7.

In step 6, the values of traffic congestion driving, city driving, high speed driving, and sport driving for all driving state parameters are integrated, and their frequency distributions are created.

This frequency distribution is the total number of each frequency (a + b + c
If it is compressed and created so that +d) becomes 1, it will represent the degree of satisfaction.

Here, steps 5 and 6 correspond to satisfaction calculation means, and among them, step 5 in particular corresponds to allocation means.

In step 7, a determination value of the driving state is obtained from each satisfaction level regarding traffic jam driving, city driving, high speed driving, and sports driving.

That is, driving in traffic jams, driving around town, and driving at high speeds.

The weights for each of these driving conditions are set as X+ + X2 + X3 so that the numerical value increases in the order of sports driving.
+2 x4 is determined in advance (for example, when driving in traffic jam x, = 0.2
．． City driving X2 = o, 4. High speed running X3=o.

6. Sports driving X 4 =0.8), each frequency value a.

When b, c, and d are used, the weighted average is taken from the following equation to calculate the judgment value X.

The centroid of the product may be determined and used as the determination value.

Here, the portion of step 7 corresponds to the driving state determining means.

As described above, the determination value X of the driving state is obtained, and the numerical value from small to large represents driving in traffic jams, driving in the city, high speed driving, and sports driving.

According to this determination value X, a characteristic of accelerator operation amount-target throttle valve opening degree that is suitable for the driving condition is selected, and it becomes possible to control the throttle valve opening degree that optimally matches the driving condition.

The throttle valve opening control based on the determination value X will be explained below with reference to the flowchart shown in FIG.

In step 11, the accelerator operation M A P is read from the accelerator sensor 6, and the Scottle valve opening degree TVO is read from the throttle sensor 7.

In step 12, the driving state determination value
When driving in the city or at high speed between the predetermined value CI and C2, the process goes to step 14, and when the sport driving is over the predetermined value 02, the process goes to step 15.

In step 13.14.15, the accelerator operation amount A that has been set in accordance with each of the driving conditions and stored in the ROM is
Referring to the characteristic map of P-target throttle valve opening TVO0, the target throttle valve opening TVO corresponding to the detected accelerator operation amount AP is searched.

Here, the maps used in steps 13, 14, and 15 are different.

If the map of step 14 is normal, step 1
Map 3 is for driving in traffic jams, so set the throttle valve opening to start up later. It is set to .

Next, proceed to step 16, and step 13.14゜1
The target throttle valve opening TVO retrieved in step 5 and the actual throttle valve opening TV read in step 1.
Compare with O.

If TVO,>T''VO, the process proceeds to step 17, where a signal in the direction of increasing the throttle valve opening is output to the DC motor 3, and if TVO,<TVO, step 1
Proceed to step 8 and output a signal in the direction of decreasing the throttle valve opening.
If TVOo=TVO, this routine is ended and the current status is maintained. In detail, the deviation between the target throttle valve opening TVO and the actual throttle valve opening TVO is determined, and the opening/closing control amount is set in accordance with the deviation to perform feedback control.

That is, step 12 of selecting a characteristic based on the determination value
The function constitutes a characteristic selection means, and the ROM storing each characteristic map constitutes an opening characteristic setting means.
18 functions constitute the opening control means.

In addition, instead of comparing the judgment value Since it represents the degree of satisfaction with driving in traffic jams, it may be compared with a predetermined value.

<Effects of the Invention> As explained above, according to the present invention, factors are analyzed based on driving state parameters such as throttle valve opening and engine speed, and driving in traffic jams and city driving are determined.

Driving conditions (or driving environment) such as high-speed driving, sports driving, etc.
This allows the driver to recognize and determine the optimal throttle valve opening according to this, resulting in a significant improvement in driving feeling.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are functional block diagrams showing the configuration of the present invention, FIG. 2 is a diagram showing the evaluation function of the operating state,
FIG. 3 is a system diagram showing the configuration of an embodiment of the present invention, and FIG.
FIG. 5 is a flowchart of throttle valve opening control. ■...Intake passage 2...Throttle valve 3...
・DC motor 4...Control unit 6
...Accelerator sensor 7...Scot 1-le sensor 8...Crank angle sensor 9...Vehicle speed sensor 10...Gear position sensor

Claims (1)

[Scope of Claims] An accelerator operation amount detection means for detecting an accelerator operation amount is provided, and the throttle valve installed in the intake system of the engine is controlled to have a target throttle valve opening set according to the detected accelerator operation amount. In a throttle valve opening control device for an internal combustion engine that controls the opening of an internal combustion engine at the same time, state quantities of multiple operating state parameters including at least the throttle valve opening and the engine speed are sampled every unit time, and time-series data is obtained. A driving state parameter detecting means for obtaining a driving state parameter, a representative data creating means for creating representative data from the time series data for each driving state parameter, and an evaluation function based on the driving state parameters for a plurality of predetermined driving states. A satisfaction calculation means for calculating the degree of satisfaction of each evaluation function based on representative data of driving condition parameters, a driving condition determination means for determining the driving condition from each satisfaction degree of the plurality of evaluation functions, and a target for the amount of accelerator operation. an opening characteristic setting means for setting throttle valve opening characteristics for each different operating state; and an opening characteristic setting means for setting the opening of the corresponding operating state from the opening characteristic setting means in accordance with the operating state determined by the operating state determining means. Controlling the throttle valve to a target throttle valve opening according to the accelerator operation amount detected by the accelerator operation amount detection means using a characteristic selection means for selecting a characteristic and the opening characteristic selected by the characteristic selection means. opening control means;
A throttle valve opening control device for an internal combustion engine, comprising: